AMD Merlin Falcon: Add northbridge files for new AMD processor

Tested on Bettong. Windows 7, Windows 8.1 and Ubuntu 14.04 can boot.

Change-Id: Ifcbfa0eab74875638a40e74ba2a3bb7c4fb02761
Signed-off-by: WANG Siyuan <wangsiyuanbuaa@gmail.com>
Signed-off-by: WANG Siyuan <SiYuan.Wang@amd.com>
Reviewed-on: http://review.coreboot.org/10419
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/northbridge/amd/pi/Makefile.inc b/src/northbridge/amd/pi/Makefile.inc
index de83c51..ea92035 100644
--- a/src/northbridge/amd/pi/Makefile.inc
+++ b/src/northbridge/amd/pi/Makefile.inc
@@ -21,6 +21,7 @@
 
 subdirs-$(CONFIG_NORTHBRIDGE_AMD_PI_00630F01) += 00630F01
 subdirs-$(CONFIG_NORTHBRIDGE_AMD_PI_00730F01) += 00730F01
+subdirs-$(CONFIG_NORTHBRIDGE_AMD_PI_00660F01) += 00660F01
 
 romstage-y += agesawrapper.c
 romstage-y += def_callouts.c